Minor changes to avoid compile time errors when using visual studio 10.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403805

examples/server_http_ex.cpp

@@ -122,7 +122,7 @@ int main()
 
         // create a thread that will start the server.   The ref() here allows us to pass 
         // our_web_server into the threaded function by reference.
-        thread_function t(thread, ref(our_web_server));
+        thread_function t(thread, dlib::ref(our_web_server));
 
         cout << "Press enter to end this program" << endl;
         cin.get();

examples/sockets_ex.cpp

@@ -74,7 +74,7 @@ int main()
 
         // create a thread that will start the server.   The ref() here allows us to pass 
         // our_server into the threaded function by reference.
-        thread_function t(thread, ref(our_server));
+        thread_function t(thread, dlib::ref(our_server));
 
         cout << "Press enter to end this program" << endl;
         cin.get();

examples/sockstreambuf_ex.cpp

@@ -100,7 +100,7 @@ int main()
 
         // create a thread that will start the server.   The ref() here allows us to pass 
         // our_server into the threaded function by reference.
-        thread_function t(thread, ref(our_server));
+        thread_function t(thread, dlib::ref(our_server));
 
         cout << "Press enter to end this program" << endl;
         cin.get();

examples/thread_function_ex.cpp

@@ -56,7 +56,7 @@ int main()
     // to a thread by reference.  For example, the thread below adds
     // one to val.
     double val = 2;
-    thread_function t4(thread_increment, ref(val));
+    thread_function t4(thread_increment, dlib::ref(val));
     t4.wait(); // wait for t4 to finish before printing val.
     // Print val.  It will now have a value of 3.
     cout << "val: " << val << endl;